Machines,Media and Meaning

Ever since Icarus flew too high with his man-made wings, and suffered terrible consequences, warnings have been sounded to every would-be Daedalus who presumes to amplify human physical or intellectual powers by mechanical invention.     

全球化对职业技术教育的挑战及对策

当前,经济、政治、教育等社会诸领域的全球化已成为不可回避的大趋势。对社会进步及个体生存、发展而言,全球化的发展利弊同存,而通过加强职业技术教育有助于抓住机遇并减少其负面影响。本文阐述了由全球化在职业技术教育领域引起的新变化,并针对如何应对全球化带来的新挑战提出一些建议。     

Negative correlation between tone (S−) and water increases target biting during S− in rats

Eighteen Long-Evans rats were exposed to a MULT VT 30-sec EXT schedule of water presentations. The EXT schedule was signaled by a 2500-Hz, 70-dB tone. Mean number of bites of a plastic target during atone (S?) increased across sessions, whereas the mean number of target bites during the VT component signaled byno tone (S+) decreased across sessions. Changing the multiple schedule to MULT EXT EXT produced a decrease in target bites during the tone. Reinstating the original MULT VT 30-sec EXT schedule produced an increase in number of target bites during the tone (S?). Changing the multiple schedule to VT 30-sec VT 30-sec produced a decrease in target bites during the tone. The results indicate that target biting in rats increases in the presence of the exteroceptive tone (S?) of the MULT VT 30-sec EXT schedule, and that target biting during the tone varies directly with the negative correlation between tone and water presentations.